No such luck.
The kids come in their PJ's for various activities during the time listed in the Navigator. Goofy would stop by and do some of the activities with the kids. Once the official time for the slumber party ended, it was just like any other night at the club. My DD7 made the comment that Goofy wasn't there that long. However, I don't know what she based that on.
Good news is that if that is an evening when the kids were going to be in the club late, they already have their PJ's on, so when you do pick them up, you can put them directly to bed.